Finding the Fourth Proportional to 21,373,921.86, 31,985,201.25 and 13,290,703.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,373,921.86 : 31,985,201.25 = 13,290,703.98 : x
2. Step 2: Convert to fraction form
   21,373,921.86/31,985,201.25 = 13,290,703.98/x
3. Step 3: Cross multiply
   21,373,921.86x = 31,985,201.25 × 13,290,703.98
4. Step 4: Simplify right side
   21,373,921.86x = 425,105,841,554,476
5. Step 5: Solve for x
   x = 425,105,841,554,476/21,373,921.86
6. Step 6: Final answer
   x = 19,888,995.77